5.1.5, 5.1.6
Merge pull request #3 from sattoke/satBranch

5.1.5, 5.1.6
adding translators notes
correct translation of "Use Endpoint Address as Token Audience" section
ref #3
4.4.1.5 & 4.4.1.6
4.4.1.7
4.4.1.8 & 4.4.1.9
4.4.1.10
4.4.1.11

NOTE:
I'm confusing the meaning of "nontrivial".
My understanding might be wrong.